9 Build a Simple Local Area Network with DHCP (9/26) -- Mastering Enterprise Networks

9 Build a Simple Local Area Network with DHCP Mathew J. Heath Van Horn, PhD A Local Area Network (LAN) has many definitions depending on who you speak to. They can be defined by geography, function, or electrical connections. In this book, we typically use the term “LAN” to specify a few end devices connected to the same switch. This is a gross oversimplification of LANs, but simplification is helpful when exploring larger concepts. Consider how we use logs to represent exponential equations or ask veterans in the audience to stand for recognition. Both actions are simplifications of greater meaning. In this lab, we show you how to make a fundamental LAN with DHCP that won’t stress your host machine’s resources. Learning Concepts - Create a functional LAN with: - 1 switch - 2 PCs - 1 DHCP server Prerequisites - Chapter 2 – Setup a GNS3 environment - Chapter 5 – Install Tiny Core Linux - Chapter 6 – Adding a VM to GNS3 Deliverables - None – this is a preparatory lab for other labs resources Contributors and Testers - Jacob M. Christensen, C.I.S. Student, ERAU-Prescott - Julian Romano, C.I.S. Student, ERAU-Prescott - Cody Shinkyu Park, Honeywell Software Engineer, ERAU-Prescott Alumni - Evan Paddock, Cybersecurity Student, ERAU-Prescott - Dante Rocca, Cybersecurity Student, ERAU-Prescott - Sawyer Hansen, Cybersecurity Student, ERAU-Prescott Phase I – Inital Setup Initial setup involves creating a workspace, segmenting that workspace, and then labeling the components. By the end of the this chapter, your network should look like the following: - Ensure you have completed the prerequisites before starting the lab - Open Oracle VirtualBox Manager - Make a full clone of the TinyCoreLinux VM - Right-click on the TC-red VM and click on settings (Figure 4) - Navigate to “Network” and change the network adapter 1 settings to Generic Driver and UDPTunnel, then click OK (Figure 5) - Start GNS3 and start a new blank project. Name it anything you like, but for this example, we are calling it Simple LAN - Add the TC-red VM to the GNS3 appliances – Change its symbol to a Red Server - In the GNS3 toolbar ribbon, click on the Draw a Rectangle tool and click the workspace to place a rectangle (Figure 6) - You can use the mouse to resize the rectangle at any time - Change the properties of the rectangle by right-clicking on the edge and selecting Style (Figure 7) - Some people use a fill color and some don’t (Figure 8) - Change the border color to a primary color (we are using red) - Change the Border width to 6 px - Click apply, then click ok - GNS3 uses layers for its graphics. Generally, the shapes are at a higher layer than the connectors. This means that anything you put into the box risks not being seen. So you can change the box’s layer now or at any time by right-clicking on the shape and selecting Lower one layer (Figure 9) - Place the following inside the red rectangle - Ethernet Switch - Two (2) VPCS - TC-red VM - Connect the devices to the switch - Use t